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T874A,D,R THERMOSTATS AND Q674B,D,F,Q SUBBASES
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
H2
FALL
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
C2
RISE
PROTECTION AS REQUIRED.
Fig. 5. Internal schematic and typical hookup of T874D Thermostat with Q674F Subbase with manual changeover.
THERMOSTAT
H1
C1
FALL
H2
FALL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 6. Internal schematic and typical hookup of T874R Thermostat with
69-0107—2
1
FAN
2
SWITCH
4
6
HEAT PUMP
2 STG. HEAT
8
10
11
1
H1/C1
ANTICIPATOR
2
3
4
5
6
Q674B Subbase in heat pump system with changeover in cooling.
SUBBASE
AUTO
ON
SYSTEM
SWITCH
AUX. HT.
OFF
COOL
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
HEAT
OFF
COOL
4
SYSTEM COMPONENTS
FAN RELAY
G
R
B
W1
COMPRESSOR
RELAY
HEAT PUMP
LED (GREEN)
AUX. HT. RELAY
W2
AUX. HT
LED (RED)
C
COOL CHANGEOVER
VALVE
O
Y1
Y2
COMPRESSOR
CONTACTOR 2
SYSTEM COMPONENTS
O
COOL CHANGEOVER
VALVE
G
FAN RELAY
R
W1
AUX. HT.
RELAY
Y
COMPRESSOR
CONTACTOR
L1
(HOT)
L2
1
COMPRESSOR
CONTACTOR 1
M4730
L1
(HOT)
L2
1
M2906
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